Complete local hybrid search and improve agent reliability

SovereignAI-Starter/tests/test_embeddings.py

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+import unittest
+from unittest.mock import patch
+
+from app.embeddings import EmbeddingUnavailable, embed_texts
+
+
+class EmbeddingTests(unittest.IsolatedAsyncioTestCase):
+    async def test_empty_model_setting_reports_disabled_embedding(self) -> None:
+        with patch.dict("os.environ", {"KNOWLEDGE_EMBEDDING_MODEL": ""}):
+            with self.assertRaises(EmbeddingUnavailable):
+                await embed_texts(["sample"])
+
+    async def test_empty_input_needs_no_embedding_model(self) -> None:
+        with patch.dict("os.environ", {"KNOWLEDGE_EMBEDDING_MODEL": ""}):
+            self.assertEqual(await embed_texts([]), [])
+
+
+if __name__ == "__main__":
+    unittest.main()